libstdc++-v3/testsuite/27_io/basic_istream/getline/wchar_t/5.cc

   1 // Copyright (C) 2004 Free Software Foundation
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 2, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING.  If not, write to the Free
  16 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17 // USA.
  18
  19 // 27.6.1.3 unformatted input functions
  20
  21 #include <istream>
  22 #include <string>
  23 #include <fstream>
  24 #include <testsuite_hooks.h>
  25
  26 using namespace std;
  27
  28 wstring
  29 prepare(wstring::size_type len, unsigned nchunks, wchar_t delim)
  30 {
  31   wstring ret;
  32   for (unsigned i = 0; i < nchunks; ++i)
  33     {
  34       for (wstring::size_type j = 0; j < len; ++j)
  35         ret.push_back(L'a' + rand() % 26);
  36       len *= 2;
  37       ret.push_back(delim);
  38     }
  39   return ret;
  40 }
  41
  42 void
  43 check(wistream& stream, const wstring& str, unsigned nchunks, wchar_t delim)
  44 {
  45   bool test __attribute__((unused)) = true;
  46
  47   static wchar_t buf[1000000];
  48   wstring::size_type index = 0, index_new = 0;
  49   unsigned n = 0;
  50
  51   while (stream.getline(buf, sizeof(buf) / sizeof(wchar_t), delim))
  52     {
  53       index_new = str.find(delim, index);
  54       VERIFY( stream.gcount() == index_new - index + 1 );
  55       VERIFY( !str.compare(index, index_new - index, buf) );
  56       index = index_new + 1;
  57       ++n;
  58     }
  59   VERIFY( stream.gcount() == 0 );
  60   VERIFY( stream.eof() );
  61   VERIFY( n == nchunks );
  62 }
  63
  64 void test01()
  65 {
  66   const char filename[] = "wistream_getline.txt";
  67
  68   const wchar_t delim = L'|';
  69   const unsigned nchunks = 10;
  70   const wstring data = prepare(777, nchunks, delim);
  71
  72   wofstream ofstrm;
  73   ofstrm.open(filename);
  74   ofstrm.write(data.data(), data.size());
  75   ofstrm.close();
  76
  77   wifstream ifstrm;
  78   ifstrm.open(filename);
  79   check(ifstrm, data, nchunks, delim);
  80   ifstrm.close();
  81 }
  82
  83 int main()
  84 {
  85   test01();
  86   return 0;
  87 }